My 5th version of the Proton Rifle was a commissioned piece where the person requesting wanted one based off of the first two versions, which are built up off of the Nerf Rattler Super Soaker rifle. I used that water gun yet again for this build but decided to make some enhancements. I lengthened the front grip and added a longer barrel. The "power pack" attached by hose now has lights running off of separate batteries.